Side air bag, from chassis number W3088397 (US X3005844)
| Side air bag, from chassis number W3088397 (US X3005844) |
The side airbags are concealed under the backrest upholstery fabric on the front seats. The side airbags are connected to control module pins 10 and 11 (driver's seat) and 13 and 14 (passenger's seat).
The purpose of the side airbag in the event of a side collision is to reduce the force of the impact on the person sitting on that side. This is accomplished by an airbag inflating between the occupant's upper body and the side of the door.
The side airbags, which have a volume of about 25 litres, incorporate a gas generator. The airbag and gas generator are protected by a plastic cover with fracture lines.
The side airbag is specific to the seat and car in which it is fitted. There are 4 different side airbags:
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Driver, LHD and RHD
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Passenger, LHD and RHD
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| Side airbag gas generator |
The gas generator consists of a steel housing, electric detonator, explosive charge and pressurized vessel containing 98% argon and 2% helium. The gas pressure is 250 bar. On receiving an activation command, the control module sends a current pulse to the detonator which ignites the fuel. The pressure generated by the resulting explosion breaks the pressure vessel sealing and the pressurized air flows out via the filter and fills the airbag.
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